Shouldn't Solo 401k employer contribution count as business expense and reduce tax burden?

I have a W-2 and 1099.

I maxxed out my 401k  employee contribution via my W2 job. In this case, I am only able to contribute the employER contribution to my solo 401k. However, when I enter the calculated employer comtribution, my tax burden does not change. Shouldn't this contribution reduce my taxable income? Wouldnt this considered a business expense? is turbo tax faulty? Should I just enter this under business expense since that is what it is?  Please help.

 

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